The Atmos AG??? 65 is the best-fitting, most ventilated, and comfortable pack ever made for traditional backpacking trips up to a week or more in duration. The innovative AntiGravity??? suspension makes it feel like you're carrying less weight and seamlessly wraps around your body, which means you'll enjoy every mile more than ever. From easy-to-use stretch mesh side pockets, Stow-on-the-Go??? trekking pole attachment, and FlapJacket??? for lidless use, the Atmos AG??? 65 is still the top contender.. . Body: 100D X 630D Nylon Dobby. Accent: 210D High Tenacity Nylon. Bottom: 420HD Nylon Packcloth. Anti-Gravity??? Suspension: Osprey???s Anti-Gravity???, LightWire???-tensioned, full peripheral suspension features a continuous backpanel of lightweight mesh extending from the top of the backpanel to the hipbelt to provide unmatched comfort and ventilation. The seamless structure automatically contours to the body, providing outstanding fit and unrestricted movement and comfortably transfers pack load.. FlapJacket???: A removable floating lid can be replaced with a fixed FlapJacket??? to protect your gear and minimize weight.. Organization: An adjustable stretch mesh front panel pocket provides additional external storage and organizational options. Dual zippered front panel pockets allow additional internal storage and organizational options. . Removable floating top lid with dual zippered pockets and web attachment points. Integrated FlapJacket??? protects gear when top lid is removed. Stow-on-the-Go??? trekking pole attachment allows you to stow your poles in steep terrain or whenever you need your hands free. Adjustable harness and Fit-on-the-Fly??? hipbelt to dial-in the perfect fit. Internal hydration reservoir sleeve accommodates up to a 3L reservoir. Front stretch mesh pocket stores rain gear for easy access when skies darken, or wet gear after the downpour stops